Nov. 20, 2001: Ottile Lundgren, 94, of Connecticut is diagnosed with anthrax. She dies the next day.

April 18, 2002: Anthrax spores matching the profile of those sent in the letters are found outside a containment area at Fort Detrick are found, including inside the office of Dr. Bruce Ivins. Ivins had been testing spores at Fort Detrick since the attack occurred.

April 11, 2007: Ivins is placed under periodic surveillance and is declared a suspect in connection with the attacks.